Anyway, either we live in a civilised era where things like ethnic cleansing and genocide should be condemned, or we live in an era where it is 'bog standard to invade a place occupied by your co-ethnics'.
After WW2, ethnic Germans were expelled from Czechoslovakia, Poland, and Königsberg and Poles and Ukrainians were uprooted forcefully into the boundaries of their modern nation-states.
If wars of conquest on the basis of 'this place contains our people' become 'bog standard', the ethnic cleansing of post-WW2 Europe and the post-Soviet Balkans becomes the inevitable and logical conclusion.
And it had considerably fewer Ukrainians[1]. The Ukrainian claim to Crimea is weaker than Russia's.
[1] https://upload.wikimedia.org/wikipedia/commons/6/6a/Ethnic_P...
> The Ukrainian claim to Crimea is weaker than Russia's.
The Ukrainian claim to Crimea is stronger because they have a legal basis to its claim. If we return to a state of the world where claims to land are made on the basis of 'my group lives here, therefore it's ours', we will inevitably reap the consequences of post-war Europe.
On the same logic, Germany had a stronger claim to the Sudetenland than Czechoslovakia. But what did that get the Germans in the end? Complete expulsion from the Sudetenland.
> Before that, Taiwan was part of the Qing empire before being invaded by the Japanese.
Anschluss is German reunification because Austria was part of the Holy Roman Empire. Ditto for the Sudetenland, and, well, why not the rest of Czechia, too.